C/2015 H2 PANSTARRS
more info
Comet C/2015 H2 was discovered on 24 April 2015 with Pan-STARRS 1 telescope (Haleakala), that is about 1.4 year before its perihelion passage. Some prediscovery images of this comet were found: taken on 20 April 2015 by Polonia Observatory (San Pedro de Atacama) and 19 May 2014 by Pan-STARRS 1, Haleakala. This comet was observed until 22 October 2019 (is still observable).
Comet had its closest approach to the Earth on 26 June 2016 (4.196 au), about 2.5 months before its perihelion passage.
Solution given here is based on data spanning over 3.51 yr in a range of heliocentric distances: 7.96 au – 4.960 au (perihelion) – 5.97 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that likely lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).

solution description
number of observations 152
data interval 2014 05 19 – 2017 11 22
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.96 au – 4.97 au (perihelion) – 5.97 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 302
RMS [arcseconds] 0.45
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 2316 02 10
perihelion date 2016 09 13.87723324 ± 0.00079613
perihelion distance [au] 4.96154921 ± 0.00000569
eccentricity 1.00251728 ± 0.00000880
argument of perihelion [°] 287.849478 ± 0.000086
ascending node [°] 350.732739 ± 0.000024
inclination [°] 33.699778 ± 0.000015
recip semi-major axis [10-6 au-1] -507.36 ± 1.77